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From: Richard Weinberger <richard@nod.at>
To: Christoph Hellwig <hch@lst.de>
Cc: Dan Williams <dan.j.williams@intel.com>,
	arnd@arndb.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com,
	tglx@linutronix.de, ross.zwisler@linux.intel.com,
	akpm@linux-foundation.org, jgross@suse.com, x86@kernel.org,
	toshi.kani@hp.com, linux-nvdimm@lists.01.org,
	benh@kernel.crashing.org, mcgrof@suse.com,
	konrad.wilk@oracle.com, linux-kernel@vger.kernel.org,
	stefan.bader@canonical.com, luto@amacapital.net,
	linux-mm@kvack.org, geert@linux-m68k.org, ralf@linux-mips.org,
	hmh@hmh.eng.br, mpe@ellerman.id.au, tj@kernel.org,
	paulus@samba.org
Subject: Re: [PATCH v5 6/6] arch, x86: pmem api for ensuring durability of persistent memory updates
Date: Wed, 24 Jun 2015 14:35:55 +0200	[thread overview]
Message-ID: <558AA42B.2050505@nod.at> (raw)
In-Reply-To: <20150624120820.GA17542@lst.de>

Am 24.06.2015 um 14:08 schrieb Christoph Hellwig:
> On Tue, Jun 23, 2015 at 12:39:09PM +0200, Richard Weinberger wrote:
>> Not sure if I understand this correctly, is the plan to support pmem also on UML?
>> At least drivers/block/pmem.c cannot work on UML as it depends on io memory.
>>
>> Only x86 seems to have ARCH_HAS_NOCACHE_UACCESS, if UML would offer these methods
>> what drivers need them? I'm still not sure where it would make sense on UML as
>> uaccess on UML means ptrace() between host and guest process.
> 
> Ok, that makese snese.  Dan, how about just moving the new pmem helpers
> from cacheflush.h to a new asm/pmem.h to avoid having them dragged into
> the um build?

If UML does not build for whatever reason, please CC me.
I'll happily help out. Historically UML includes a lot stuff
it should not. So, untangling header dependencies does often
wonders. :-)

Thanks,
//richard

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WARNING: multiple messages have this Message-ID (diff)
From: Richard Weinberger <richard@nod.at>
To: Christoph Hellwig <hch@lst.de>
Cc: Dan Williams <dan.j.williams@intel.com>,
	arnd@arndb.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com,
	tglx@linutronix.de, ross.zwisler@linux.intel.com,
	akpm@linux-foundation.org, jgross@suse.com, x86@kernel.org,
	toshi.kani@hp.com, linux-nvdimm@ml01.01.org,
	benh@kernel.crashing.org, mcgrof@suse.com,
	konrad.wilk@oracle.com, linux-kernel@vger.kernel.org,
	stefan.bader@canonical.com, luto@amacapital.net,
	linux-mm@kvack.org, geert@linux-m68k.org, ralf@linux-mips.org,
	hmh@hmh.eng.br, mpe@ellerman.id.au, tj@kernel.org,
	paulus@samba.org
Subject: Re: [PATCH v5 6/6] arch, x86: pmem api for ensuring durability of persistent memory updates
Date: Wed, 24 Jun 2015 14:35:55 +0200	[thread overview]
Message-ID: <558AA42B.2050505@nod.at> (raw)
In-Reply-To: <20150624120820.GA17542@lst.de>

Am 24.06.2015 um 14:08 schrieb Christoph Hellwig:
> On Tue, Jun 23, 2015 at 12:39:09PM +0200, Richard Weinberger wrote:
>> Not sure if I understand this correctly, is the plan to support pmem also on UML?
>> At least drivers/block/pmem.c cannot work on UML as it depends on io memory.
>>
>> Only x86 seems to have ARCH_HAS_NOCACHE_UACCESS, if UML would offer these methods
>> what drivers need them? I'm still not sure where it would make sense on UML as
>> uaccess on UML means ptrace() between host and guest process.
> 
> Ok, that makese snese.  Dan, how about just moving the new pmem helpers
> from cacheflush.h to a new asm/pmem.h to avoid having them dragged into
> the um build?

If UML does not build for whatever reason, please CC me.
I'll happily help out. Historically UML includes a lot stuff
it should not. So, untangling header dependencies does often
wonders. :-)

Thanks,
//richard

  reply	other threads:[~2015-06-24 12:35 UTC|newest]

Thread overview: 85+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-06-22  8:24 [PATCH v5 0/6] pmem api, generic ioremap_cache, and memremap Dan Williams
2015-06-22  8:24 ` Dan Williams
2015-06-22  8:24 ` [PATCH v5 1/6] arch, drivers: don't include <asm/io.h> directly, use <linux/io.h> instead Dan Williams
2015-06-22  8:24   ` Dan Williams
2015-06-22 16:01   ` Christoph Hellwig
2015-06-22 16:01     ` Christoph Hellwig
2015-06-22  8:24 ` [PATCH v5 2/6] arch: unify ioremap prototypes and macro aliases Dan Williams
2015-06-22  8:24   ` Dan Williams
2015-06-22 16:10   ` Christoph Hellwig
2015-06-22 16:10     ` Christoph Hellwig
2015-06-22 17:12     ` Dan Williams
2015-06-22 17:12       ` Dan Williams
2015-06-23 10:07       ` Christoph Hellwig
2015-06-23 10:07         ` Christoph Hellwig
2015-06-23 15:04         ` Dan Williams
2015-06-23 15:04           ` Dan Williams
2015-06-24 12:24           ` Christoph Hellwig
2015-06-24 12:24             ` Christoph Hellwig
2015-06-30 22:57     ` Dan Williams
2015-06-30 22:57       ` Dan Williams
2015-06-30 22:57       ` Dan Williams
2015-07-01  6:23       ` Christoph Hellwig
2015-07-01  6:23         ` Christoph Hellwig
2015-07-01  6:23         ` Christoph Hellwig
2015-07-01  6:55         ` Geert Uytterhoeven
2015-07-01  6:55           ` Geert Uytterhoeven
2015-07-01  6:55           ` Geert Uytterhoeven
2015-07-01  6:59           ` Christoph Hellwig
2015-07-01  6:59             ` Christoph Hellwig
2015-07-01  6:59             ` Christoph Hellwig
2015-07-01  7:19             ` Geert Uytterhoeven
2015-07-01  7:19               ` Geert Uytterhoeven
2015-07-01  7:19               ` Geert Uytterhoeven
2015-07-01  7:28               ` Christoph Hellwig
2015-07-01  7:28                 ` Christoph Hellwig
2015-07-01  7:28                 ` Christoph Hellwig
2015-07-07  9:50                 ` Luis R. Rodriguez
2015-07-07  9:50                   ` Luis R. Rodriguez
2015-07-07  9:50                   ` Luis R. Rodriguez
2015-07-07 10:13                   ` Russell King - ARM Linux
2015-07-07 10:13                     ` Russell King - ARM Linux
2015-07-07 10:13                     ` Russell King - ARM Linux
2015-07-07 10:27                     ` Geert Uytterhoeven
2015-07-07 10:27                       ` Geert Uytterhoeven
2015-07-07 10:27                       ` Geert Uytterhoeven
2015-07-07 16:07                     ` Luis R. Rodriguez
2015-07-07 16:07                       ` Luis R. Rodriguez
2015-07-07 16:07                       ` Luis R. Rodriguez
2015-07-07 23:10                       ` Toshi Kani
2015-07-07 23:10                         ` Toshi Kani
2015-07-07 23:10                         ` Toshi Kani
2015-07-09  1:40                         ` Luis R. Rodriguez
2015-07-09  1:40                           ` Luis R. Rodriguez
2015-07-09  1:40                           ` Luis R. Rodriguez
2015-07-09 23:43                           ` Toshi Kani
2015-07-09 23:43                             ` Toshi Kani
2015-07-09 23:43                             ` Toshi Kani
2015-07-01  8:09           ` Russell King - ARM Linux
2015-07-01  8:09             ` Russell King - ARM Linux
2015-07-01  8:09             ` Russell King - ARM Linux
2015-07-01 16:47             ` Dan Williams
2015-07-01 16:47               ` Dan Williams
2015-07-01 16:47               ` Dan Williams
2015-07-09 18:54   ` Luis R. Rodriguez
2015-07-09 18:54     ` Luis R. Rodriguez
2015-06-22  8:24 ` [PATCH v5 3/6] cleanup IORESOURCE_CACHEABLE vs ioremap() Dan Williams
2015-06-22  8:24   ` Dan Williams
2015-06-22  8:24 ` [PATCH v5 4/6] devm: fix ioremap_cache() usage Dan Williams
2015-06-22  8:24   ` Dan Williams
2015-06-22  8:24 ` [PATCH v5 5/6] arch: introduce memremap_cache() and memremap_wt() Dan Williams
2015-06-22  8:24   ` Dan Williams
2015-06-22  8:24 ` [PATCH v5 6/6] arch, x86: pmem api for ensuring durability of persistent memory updates Dan Williams
2015-06-22  8:24   ` Dan Williams
2015-06-22 16:17   ` Christoph Hellwig
2015-06-22 16:17     ` Christoph Hellwig
2015-06-22 17:51     ` Dan Williams
2015-06-22 17:51       ` Dan Williams
2015-06-23 10:09       ` Christoph Hellwig
2015-06-23 10:09         ` Christoph Hellwig
2015-06-23 10:39     ` Richard Weinberger
2015-06-23 10:39       ` Richard Weinberger
2015-06-24 12:08       ` Christoph Hellwig
2015-06-24 12:08         ` Christoph Hellwig
2015-06-24 12:35         ` Richard Weinberger [this message]
2015-06-24 12:35           ` Richard Weinberger

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